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Igor Opaniuk
702abb441f
Automated flashing pipelines often re-program identical content on every
run, which dominates total flash time on slow storage like spinor. With
the <getsha256digest> primitive now exposed, qdl can ask the device for
the SHA-256 of the target region before each <program> and skip the
write when it already matches what would have been sent.
Add --skipblock=<none|sha256>, defaulting to none. When sha256 is
selected, firehose_program() hashes the bytes it would otherwise stream
to the device - reading num_partition_sectors * SECTOR_SIZE_IN_BYTES
from the file with zero-padding for the trailing partial sector, exactly
matching what the existing chunked write path puts on the wire - then
asks the device for the digest of the same region via
firehose_getsha256digest(), reusing the op->digest field that the
sha256 subcommand path also reads. On a match, the <program> is skipped
entirely and "skipped \"<label>\" (sha256 match)" is logged in place of
the usual flashed-at-rate line.
The optimization is gated on three conditions, all enforced silently:
- !program->sparse: each sparse chunk would need its own digest;
keeping sparse images on the normal program path avoids per-chunk
round trips and the bookkeeping that would come with them.
- !program->is_nand: NAND spare/OOB byte semantics differ across
programmers, so the digest the device returns is not guaranteed to
correspond to the bytes qdl would compute locally.
- VIP disabled: <getsha256digest> is not part of pre-built VIP
digest tables, so issuing it under VIP would cause a hash mismatch
on the device.
Any failure on the optimization path - file read error, query failure,
digest absent, or digest mismatch - falls through to the normal program
flow. The file position is restored unconditionally by the existing
qdl_file_seek() at the top of the write loop, so the fall-through path
is byte-identical to --skipblock=none.
[1] https://github.com/linux-msm/qdl/issues/237
Signed-off-by: Igor Opaniuk <igor.opaniuk@oss.qualcomm.com>
41 lines
1.0 KiB
C
41 lines
1.0 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause */
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/*
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* Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
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*/
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#ifndef __QDL_FILE_H__
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#define __QDL_FILE_H__
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#include <sys/types.h>
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struct zip_file;
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enum qdl_file_type {
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QDL_FILE_TYPE_UNKNOWN,
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QDL_FILE_TYPE_POSIX,
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QDL_FILE_TYPE_ZIP,
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};
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struct qdl_file {
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enum qdl_file_type type;
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size_t size;
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int fd;
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struct zip_file *zip_file;
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};
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struct qdl_zip;
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int qdl_file_open(struct qdl_zip *qzip, const char *filename, struct qdl_file *file);
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void *qdl_file_load(struct qdl_file *file, size_t *len);
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void qdl_file_close(struct qdl_file *file);
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size_t qdl_file_getsize(struct qdl_file *file);
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ssize_t qdl_file_read(struct qdl_file *file, void *buf, size_t len);
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ssize_t qdl_file_read_exact(struct qdl_file *file, void *buf, size_t len);
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off_t qdl_file_seek(struct qdl_file *file, off_t offset, int whence);
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int qdl_zip_open(const char *filename, struct qdl_zip **__qdl_zip);
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struct qdl_zip *qdl_zip_get(struct qdl_zip *qzip);
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void qdl_zip_put(struct qdl_zip *qzip);
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#endif
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